Double skip or kibble for automatically receiving loose material.



P. VOLKENBORN.

DOUBLE SKIP 0R KIBBLE FOR AUTOMATICALLY RECEIVING LOOSE MATERIAL.

APPLICATION FILED APR. 24. I913- Patented Nov. 21,1916.

PAUL VOLKENBORN, OF COLOGNE- EI-IRENFELD, GERMANY.

DOUBLE SKIP OR KIBBLE FOR AUTOMATICALLY RECEIVING LOOSE MATERIAL.

Specification of Letters Patent.

Patented Nov. 21, 1916.

Application filed. April 24, 1913. Serial No. 763,194.

To all whom it may concern Be it known that I, PAUL VOLKENBORN, subject of the German Emperor, residing at Cologne-Ehrenfeld, Germany, have invented a new and useful Improvement in or Relating to Double Skips or Kibbles for Automatically Receiving Loose Material; and I do hereby declare the following to be a full, clear, and exact description of the same.

This invention relates to double hoisting grabs or kibbles and the like, which are particularly adaptable for scooping and pick ing up loose material, the device comprising a pair of oppositely acting scoops or kibbles which are mounted upon a single frame.

It has heretofore been attempted to remove loose material such as crushed stone and other hard substances by the use of grabs of this character, but it has been found that even where a construction is used in which the cutting edges of the pair of scoops do not come in contact with each other when the buckets are in. what may be termed their closed position, which is preferable for material of this character, that is, one in which the material can no longer drop out of them, yet these constructions have not heretofore proved to be entirely satisfactory, for several reasons. The length of the path through which each of the scoops must be moved when their edges are not brought into contact, is considerably longer than the circular path through which they are moved to bring their cutting edges in contact. This necessitates that the parts of the mechanism used in actuating the scoops will also move through a longer path, the result being an excessively high and topheavy frame construction; it has also heretofore been difficult, by means of the actuating mechanism, to exert a continuous turning movement to the scoops, which is necessary where the material to be lifted consists of coarse, hard pieces such as stone, and the like. This invention aims to overcome these difficulties by a particular mounting of the scoops upon the frame as well as by a particular actuating mechanism for imparting to the scoops a turning movement. Broadly speaking, the scoops, instead of being pivoted directly to the frame, are so mounted upon a movable part that as the scoops are moved from their fully open to their fully closed position the pivotal point of the scoop with respect to the frame varies so that as the scoops are opened the pivotal point is moved upwardly with respect to the frame, while in the closing movement the pivotal point is moved in the opposite direction. This is accomplished by means of right angled bell crank levers pivoted to the frame; to one arm of each a scoop is pivoted adjacent one of its rear ends. The other arms of the bell cranks .and the front ends of the scoops are connected to a vertically movable part of the actuating mechanism by separate links or rods so that the point of attachment between the arms and scoops moves from a point materially below the pivotalpoint of attachment of the bell crank with the frame to a point a substantially equal distance above it, the mounting of the scoop in this manner giving to the cutting edge of the scoops a movement in a flat elliptical curve. The cutting edges of the scoops are therefore, throughout the greater length of the path of their movements, in a position to most easily pick up the loose material. The construction of the double grab is illustrated in the accompanying drawings, in which Figures 1 to 4 show in side elevation four different positions of the scoops following their movement from closed to open position.

The frame'for the scoops, which has been designated 1, is similar to that ordinarily used for apparatus of this character, and pivoted to it, as at 3, adjacent its lower outer ends, are oscillating bell crank levers 2. A scoop 5 is pivoted to each of the bell crank levers 2, as at 4, the pivotal point being arranged adjacent the rear ends of the scoops. The other arms of the bell crank levers 2 are connected to rods or rigid links 7, as at 6, which in turn are connected at their other ends to the movable pulley block 8, supported for vertical movement within the frame 1.

The front ends of each of the scoops are connected by separate rods or links 9, to the pulley blocks 8, at a point adjacent the connection of the rods 7 with this block, the link rods 7 and 9 being preferably of substantially equal length. The arms of each bell crank lever 52 are arranged at substantially right angles to each other and in the closed position of the scoops, the bell crank is arranged so that the pivotal point 4 of attachment between it and the scoop 2 is a considerable distance below the pivotal point 3 which connects the bell crank to the frame.

As the pulley block 8 is lowered, as shown in Fig. 2 the pivotal points 6 of the bell cranks move outwardly, the links or rods 7 and 9 separating to a greater extent than they are in their normal, closed position.

This outward and downward movement of the pivotal point 6 of the hell crank causes the point 4: of the bell crank to rise, which causes the rear end of the scoop to also rise. Simultaneously with this upward movement of the rear end of the scoop, the front ends are lowered by means of the rigid links 9, so that the front or cutting edge of the scoop travels in a flat elliptical curve rather than in a true circular are, as occurs when the scoop is pivoted directly to the frame. Since the forward and rear ends of the scoop are simultaneously moved in the manner described, the effect is the same as if the scoop were rotating upon an imaginary axis intermediate the two, so that the amount which the pulley block 8 has to 'be lowered to move the scoops to their fully open position, is materially decreased. The closing movements of the scoops, as depicted in Figs. 3 and 4, are similarto those V the pivoted point 3.

described, the scoopin closing following thev flat elliptical curve which is shown in Fig. 4.

It will be seen that by using separate links 7 and 9 of substantially equal length, and utilizing a bell crank whose arms are at substantially right angles to each other, the path of travel of the rear end of the scoop is materially increased, traveling from a point below to a point considerably above The two links con? nected to the pulley block in this manner,

. serve also to cause the force acting upon the scoops as they are moved to their closed position,-to be continuous, and will thus in sure that the maximum amount of loose material will be taken up by the scoops.

Having fully described my invention, what I claim and desire to secure by Letters Patent is 1. In a device of the character described, a frame, a pulley block vertically movable in said frame, a pair of hell crank levers having their arms arranged at substantially right angles to each other pivotally mounted on said frame, a scoop pivotally mounted to one arm of each of said bell crank levers adjacent their rear ends and separate links of substantially equal length connected to the other'ends of each of said scoops, and to the other arms of the bell cranks, respectively.

2. In a device of the character described, a frame, a pulley block vertically movable in said frame, a pair of bell crank levers having arms disposed at substantially right angles to each other pivotally mounted on said frame, scoops pivotally connected adjacent their rear ends to one arm ofeach of said bell cranklevers, and separate links connecting the other ends of said scoops and the other arms of the bell crank levers, respectively, to said pulley block, said links being of a length to cause the pivotal point of attachment of a bell crank to each of the scoops to be moved a substantial distance above and below the fixed pivotal point of attachment between the bell cranks and frame.

In testimony whereof I, have signed my name to this specification in the presence of two subscribing witnesses.

,PAUL VOLKENBORN.

VVitnes'ses LOUIS VANDORY,

ALBERT PIETRKOWSKI.

Copies of this patent may be obtained for five cents each, addressing the Commissioner of Patents.

Washington, D. G. 

